Field Guide 20: a 38-item checklist for pull requests where a model wrote the first draft, covering hallucinated packages and imports (slopsquatting), invented props and values, raw values, accessibility regressions, security risks from the OWASP Top 10 for LLM Applications 2025, and tests that assert nothing. The kit has a GitHub pull request template with the same item numbers and a zero-dependency checker that reads imports, JSX props and test bodies against package.json, the design system's exports and the Field Guide 02 contract. On the fixture pull request it reports 11 errors and 4 warnings; on the clean version of the same dialog, none.
When coding agents or assistants open or draft pull requests against your product code, or before you let generated UI code merge with only a skim.